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E90/E91/E92/E93 (2006 - 2013) The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

I can't imagine warranty would be affected other than any coverage for the finish on the wheels, obviously. Wheels are easily replaced if you like the car otherwise. There are used ones up for sale on the forums all the time, and you'd probably find someone else who likes those wheels as they are if you don't. Refinishing is also always an option, though it'll cost a few bucks.